if you could give us the file contents then we can help us .Actually i think you have downloaded the source package . so tell us what are the contents of that file and one more thing is look for README or INSTALL file in that , those gonna have installation instructions .
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RajaMar 29 '12 at 18:05

1 Answer
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Assuming you've downloaded it legally, then install.linux is probably a script you have to run which self-extracts and runs an installer. It doesn't look like they provide a debian package which you would install with dpkg, and modelsim not being free/open source software, is not available in the Ubuntu archives, so apt-get install won't work to install it. You probably need to do the following: